文本框的电子邮件验证 [英] Email validation for textbox

问题描述

我编写了以下代码来验证textbox 的电子邮件.它不允许DOT(.)，但是我只允许一次DOT(.).我应该在以下代码中删除哪一个?

I wrote the following code to validate the textbox for email. It''s not allowing DOT(.) but I want to allow the DOT(.) only once. Which one should I delete in the following code?

if(document.getElementById(txtemail).value=="")
      {
                 alert(Email id can not be blank)
                document.getElementById(txtemail).focus();
                return false;
      }
     var emailPat = /^(\.*\"|[A-Za-z]\w*)@(\[\d{1,3}(\.\d{1,3}){3}]|[A-Za-z]\w*(\.[A-Za-z]\w*)+)$/;
     var emailid=document.getElementById(txtemail).value;
     var matchArray = emailid.match(emailPat);
     if (matchArray == null)
    {
               alert("Your email address seems incorrect. Please try again.);
               document.getElementById(txtEmail).focus();
               return false;
    }

 }

推荐答案

/; var emailid = document.getElementById(txtemail).value; var matchArray = emailid.match(emailPat); 如果(matchArray == null) { alert("您的电子邮件地址似乎不正确.请再次返回 假； } }

/; var emailid=document.getElementById(txtemail).value; var matchArray = emailid.match(emailPat); if (matchArray == null) { alert("Your email address seems incorrect. Please try again.); document.getElementById(txtEmail).focus(); return false; } }

您的验证表达式错误.
在一个以下使用

Your validation expression is wrong.
Use below one

var emailPat = /^(\".*\"|[A-Za-z]\w*)@(\[\d{1,3}(\.\d{1,3}){3}]|[A-Za-z]\w*(\.[A-Za-z]\w*)+)

/

或

请参阅下面的JavaScript代码以验证电子邮件ID.我们主要使用它

Or

See below JavaScript code to validate email id. We mostly use it

<script language="Javascript">


function echeck(str) {

		var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		if (str.indexOf(at)==-1){
		   alert("Invalid E-mail ID")
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("Invalid E-mail ID")
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("Invalid E-mail ID")
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("Invalid E-mail ID")
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("Invalid E-mail ID")
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    alert("Invalid E-mail ID")
		    return false
		 }
		
		 if (str.indexOf(" ")!=-1){
		    alert("Invalid E-mail ID")
		    return false
		 }

 		 return true					
	}

function ValidateForm(){
	var emailID=document.frmSample.txtEmail
	
	if ((emailID.value==null)||(emailID.value=="")){
		alert("Please Enter your Email ID")
		emailID.focus()
		return false
	}
	if (echeck(emailID.value)==false){
		emailID.value=""
		emailID.focus()
		return false
	}
	return true
 }
</script>

希望对您有帮助:)

Hope this may help you :)

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